linux-kernel - Re: queued patches for SCSI for 2.6.24

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Date:	Tue, 25 Sep 2007 22:45:53 -0500
From:	James Bottomley <James.Bottomley@...elEye.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Matthew Wilcox <matthew@....cx>, FUJITA Tomonori <tomof@....org>,
	akpm@...ux-foundation.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, fujita.tomonori@....ntt.co.jp
Subject: Re: queued patches for SCSI for 2.6.24

On Tue, 2007-09-25 at 23:34 -0400, Jeff Garzik wrote:
> Matthew Wilcox wrote:
> > On Tue, Sep 25, 2007 at 10:37:33PM -0400, Jeff Garzik wrote:
> >> Are there any const-ness worries for scsi_host_template, or plans for 
> >> the future?  I do not see any other examples of the host template 
> >> members getting modified.
> > 
> > Goodness, Jeff, you haven't looked too hard.  There's dozens of examples
> > I've come across trawling the horrible unmaintained drivers.  I'd love
> > to see scsi_host_template become const, but it's not happening any time
> > soon, and we can address this little piece when the time comes.
> 
> Well, sure, the driver is the owner of that memory.
> 
> We're talking about common code.
> 
> If everybody agrees SHT is R/W in the core, Fujita-san's patch is fine.

Well, I don't like mucking with the template either.

This whole mess is generated basically because the zero default of the
template should be treated as initiator.  How about this, which makes
that manifest?

James

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index adc9559..7e26440 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -342,7 +342,11 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
 	shost->unchecked_isa_dma = sht->unchecked_isa_dma;
 	shost->use_clustering = sht->use_clustering;
 	shost->ordered_tag = sht->ordered_tag;
-	shost->active_mode = sht->supported_mode;
+	if (sht->supported_mode == MODE_UNKNOWN)
+		/* means we didn't set it ... default to INITIATOR */
+		shost->active_mode = MODE_INITIATOR;
+	else
+		shost->active_mode = sht->supported_mode;
 
 	if (sht->max_host_blocked)
 		shost->max_host_blocked = sht->max_host_blocked;
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 0088c4d..4965e9e 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -209,11 +209,13 @@ show_shost_mode(unsigned int mode, char *buf)
 static ssize_t show_shost_supported_mode(struct class_device *class_dev, char *buf)
 {
 	struct Scsi_Host *shost = class_to_shost(class_dev);
+	unsigned int supported_mode = shost->hostt->supported_mode;
 
-	if (shost->hostt->supported_mode == MODE_UNKNOWN)
-		return snprintf(buf, 20, "unknown\n");
-	else
-		return show_shost_mode(shost->hostt->supported_mode, buf);
+	if (supported_mode == MODE_UNKNOWN)
+		/* by default this should be initiator */
+		supported_mode = MODE_INITIATOR;
+
+	return show_shost_mode(shost->hostt->supported_mode, buf);
 }
 
 static CLASS_DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);


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